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[" 20) How many bricks each measuring "25times11.25times6cm" will be needed to builda wall "8m times6m times22.5cm?],[" a) "5600],[" 21) A rectangular field is to be fenced on three sides leaving a side of "20fect" uncovered "7200],[" is "680sq" ,feet,how many feet fencing will be required? "]

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A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered.If the area of the field is 680 sq.feet,how many of fencing will be required?

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